Step 1: To make lavender sugar, pulse sugar/Splenda blend together with lavender in a food processor until sugar gets a pale tint and the aroma releases; strain sugar through sieve to remove any lavender that didn't grind.
Step 2: Mix together ingredients for the streusel (it will appear pasty) and pop into the fridge while you make the batter to let it firm up.
Step 3: For muffins, mix together the flour, baking powder, baking soda and salt.
Step 4: Stir in yogurt, lemon zest, egg, vanilla and melted butter until just mixed.
Step 5: Fold in the diced rhubarb.
Step 6: Divide batter among a 12 cup greased muffin tin (or use paper liners).
Step 7: Crumble chilled streusel over the batter.
Step 8: Bake at 400F for 20-25 minutes or until a toothpick inserted comes out clean.
Step 9: Cool in pan 5 minutes, then turn out and finish cooling muffins on a wire rack.
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